diff --git a/test_problems/surfkin/surfdemo.cpp b/test_problems/surfkin/surfdemo.cpp
index d430c585f..0aad0cf7f 100644
--- a/test_problems/surfkin/surfdemo.cpp
+++ b/test_problems/surfkin/surfdemo.cpp
@@ -18,7 +18,7 @@ using namespace Cantera;
 int main() {
 
     try {
-        IdealGasMix gas("gri30.cti", "gri30");
+        IdealGasMix gas("gri30.xml", "gri30");
         gas.setState_TPX(1200.0, OneAtm, 
             "H2:2, O2:1, OH:0.01, H:0.01, O:0.01");